HARQ Feedback Disabling for Satellite PDSCH Transmission Stalling
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Solution Overview
Problem
The significant latency in satellite communication systems can cause hybrid automatic repeat request (HARQ) stalling, reducing the transmission rate for IoT devices, particularly in non-terrestrial networks.
Innovation Solution
Implementing an HARQ disabled operation by indicating an HARQ feedback state through state indication information based on target signaling, preventing HARQ feedback for specific processes to reduce stalling and improve transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is performed in satellite communication systems, then transmission reliability is improved, but transmission rate deteriorates due to HARQ stalling caused by significant latency
Solution Approach 1:
The patent changes the state parameter of HARQ feedback from enabled to disabled dynamically. By configuring the terminal to disable HARQ feedback for specific HARQ processes in satellite communication scenarios, the system eliminates HARQ stalling while maintaining necessary reliability through selective feedback disabling, thus resolving the contradiction between transmission reliability and transmission rate
2Productivity
If HARQ feedback is disabled for all processes, then transmission rate is improved by avoiding HARQ stalling, but transmission reliability deteriorates
Solution Approach 1:
The patent applies local quality by enabling selective HARQ feedback disabling for specific HARQ processes rather than globally. The network device configures the terminal to disable HARQ feedback only for designated HARQ processes (e.g., through RRC signaling or MAC CE) while maintaining feedback for other processes, thus improving transmission rate in satellite scenarios without compromising overall transmission reliability
3Reliability
If HARQ feedback is performed continuously, then error correction capability is maintained, but system complexity increases due to HARQ stalling management
Solution Approach 1:
The patent extracts the HARQ feedback mechanism from the normal transmission process in specific satellite communication scenarios. By configuring the terminal to take out (remove) HARQ feedback for certain HARQ processes when operating in NTN scenarios, the system eliminates the complexity of HARQ stalling management while maintaining error correction capability through other means, thus resolving the contradiction between reliability and system complexity
Data Source
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AI summary
Disclosed in embodiments of the present application are an indication method for disabling HARQ feedback, and an apparatus therefor, which can be applied to a communication system. The method comprises: receiving target signaling, and determining on the basis of information carried by the target signaling, state indication information; and determining, according to the state indication information, a HARQ feedback state of a target HARQ process used by scheduled PDSCH transmission. In the technical solution, whether HARQ feedback is performed in the target HARQ process used by the scheduled PDSCH transmission is indicated to a terminal device by means of the state indication information. When the target HARQ process is HARQ disabled, for the PDSCH transmission using the target HARQ process, the terminal device no longer performs HARQ feedback, such that the occurrence probability of HARO stalling can be reduced, and the transmission rate of the terminal device can thus be improved.